Despite such stark inequality, black and indigenous populations have not, until recently, mobilized along racial and ethnic lines for reform. For one thing, the idealization of mixed blood might have made minorities with lighter skin less willing to ally with their darker counterparts. Rather than fight for indigenous rights, for example, it was preferable for many to blend in as mestizos, especially because mestizos were afforded a higher social status as exemplars of the national ideal.
Deborah J. Yashar, “Does Race Matter in Latin America?,” Foreign Affairs, Volume 94, Number 2 (March/April 2015). https://www.foreignaffairs.com/articles/south-america/2015-02-16/does-race-matter-latin-america, http://omnilogos.com/how-racial-and-ethnic-identities-shape-the-regions-politics-in-latin-america.